I did check with K&N and was that they do not have a fit for the HD8 carbs.
I did find this on Denis Welch's site: https://www.bighealey.co.uk/category/catalogues/austin-healey/fuel/under-bonnet-3000
I did find this on Denis Welch's site: https://www.bighealey.co.uk/category/catalogues/austin-healey/fuel/under-bonnet-3000